.loading {
  list-style: none;
  margin: 0 auto;
  text-align: center;
  margin-top: 100px;
  position: fixed;
  z-index: 10;
  bottom: 185px;
  left: 50%;
  margin-left: -135px;
  display: none;
}

.loading li {
  width: 30px;
  height: 30px;
  border-radius: 25px;
  background-color: blue;
  display: inline-block;
  margin: 0 20px;
}

.loading li:nth-child(1) {
  animation: small-to-big 1s ease-in-out infinite;
}
.loading li:nth-child(2) {
  animation: small-to-big 1s ease-in-out 0.333s infinite;
}
.loading li:nth-child(3) {
  animation: small-to-big 1s ease-in-out 0.666s infinite;
}

@keyframes small-to-big {
  0% {
    transform: scale(0);
  }

  50% {
    transform: scale(1);
  }

  100% {
    transform: scale(0);
  }
}
